MIC4604/4605
Micrel
MIC4604/4605
Dual 1.5A-Peak Open-Drain MOSFET Driver
Preliminary Information
General Description
The MIC4604 and MIC4605 are BiCMOS/DMOS buffer-
drivers constructed with complementary MOS outputs, where
the drains of the final output totem pole have been left
disconnected so individual connections can be made to the
pull-up and pull down sections of the output. This allows the
insertion of individual drain-current-limiting resistors in the
pull up and pull down sections of the output, thus allowing the
user to define the rates of rise and fall desired for a capacitive
load, or a reduced output swing if driving a resistive load, or
to limit base current when driving a bipolar transistor. Mini-
mum rise and fall times, with no resistors, will be less than
20ns for a 1000pF load. There is no upper limit.
These devices are rugged due to extra steps taken to protect
them from failures. A modern Bipolar/CMOS/DMOS process
guarantees freedom from latchup. Proprietary circuits allow
the input to swing negative as much as 5V without damaging
the part.
For driving MOSFETs in motor-control applications, where
slow on/fast off operation is desired, these devices are
superior to the previously used technique of adding a diode
resistor combination between the driver output and the MOS-
FET, because they allow accurate control of turn-ON, while
maintaining fast turn-OFF and maximum noise immunity for
an OFF device.
Features
•
•
•
•
•
•
Independently Programmable Rise and Fall Times
Low Output Impedance ....................................... 6Ω Typ
High Speed t
R
, t
F
..................... <30ns with 1000pF Load
Short Delay Times ........................................... <25ns typ
Wide Operating Range ................................. 4.5V to 18V
Latch-Up Protection: Fully Isolated Process is Inher-
ently Immune to to Any Latch-up
• Input Withstands Negative Swings to –5V
• ESD Protected ...........................................................2kV
Applications
•
•
•
•
•
•
Motor Controls
Self-Commutating MOSFET Bridge Driver
Driving Bipolar Transistors
Drive for Nonoverlapping Totem Poles
Level Shifters
Power Management
Functional Diagram
Pin Configuration
V
DD
Pull Down A
IN A
1
2
3
4
8
Pull Up A
V DD
Pull Up B
Pull Down B
MIC4604
7
6
5
0.6mA
0.1mA
MIC4604
INVERTING
UP
IN
2kΩ
MIC4605
NONINVERTING
GND
DWN
GND
IN B
Pull Down A
IN A
GND
IN B
1
2
3
4
8
Pull Up A
V DD
Pull Up B
Pull Down B
MIC4605
7
6
5
Functional Diagram for One Driver
(Two Drivers per Package—Ground Unused Inputs)
6-10
MIC4604/4605
When used to drive bipolar transistors, this driver maintains
high speeds and allows insertion of a base current-limiting
resistor, and also provides a separate half-output for fast turn-
off. By proper positioning of the resistor, either NPN or PNP
transistors can be driven.
These drivers, since they eliminate shoot-through currents in
the output stage, require significantly less power at higher
frequencies. This can be helpful in meeting low-power
budgets.
Due to independent drains, this device can also be used as
an open-drain buffer/driver where both drains are available in
one device, thus minimizing chip count. An unused pull-down
should be returned to the ground; an unused pull-up should
be returned to V
DD
. This is to prevent static damage.
Alternatively, in situations requiring greater current-carrying
capacity, multiple MIC4604 or MIC4605s may be paralleled.
The MIC4604/4605 will not latch under any conditions within
its power and voltage ratings. It is not subject to damage
when up to 5V of noise spiking of either polarity occurs on the
ground pin. It can accept, without damage or logic upset, up
to 1.5 amps of reverse current (of either polarity) being forced
back into the outputs.
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage ........................................................... +22V
Maximum Chip Temperature .................................. +150°C
Storage Temperature Range ................... –65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................... +300°C
Package Thermal Resistance
CerDIP
θ
J-A
...................................................... 150°C/W
CerDIP
θ
J-C
........................................................ 55°C/W
PDIP
θ
J-A
.......................................................... 125°C/W
PDIP
θ
J-C
............................................................ 45°C/W
SOIC
θ
J-A
......................................................... 250°C/W
SOIC
θ
J-C
........................................................... 75°C/W
6
Ordering Information
Part Number
MIC4604BM
MIC4604BN
MIC4605BM
MIC4605BN
Logic
Inverting
Inverting
Non-Inverting
Non-Inverting
Package
8-pin SOIC
8-pin PDIP
8-pin SOIC
8-pin PDIP
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Note 1:
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions above those indicated in the operational sections of the specification is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability. Static-sensitive device. Unused devices must
be stored in conductive material. Protect devices from static discharge and static fields.
6-11
MIC4604/4605
Micrel
Electrical Characteristics
Unless otherwise specified, specifications measured at T
A
= 25°C with 4.5V < V
DD
< 18V.
Symbol
Input
V
IH
V
IL
I
IN
Output
V
OH
V
OL
R
O
R
O
I
PK
I
R
Parameter
Test Conditions
Min
Typ
Max
Unit
Logic 1 High Input Voltage
Logic 0 Low Input Voltage
Input Current
0V < V
IN
< V
DD
2.4
–5
–1
V
DD
+ 0.3
0.8
1
V
V
µA
High Output Voltage
Low Output Voltage
Output Resistance, Pull-Up
Output Resistance, Pull-Down
Peak Output Current
Latch-up Protection
I
OUT
= 10mA, V
DD
= 18V
I
OUT
= 10mA, V
DD
= 18V
Any Drain
Any Drain
Reverse Current
V
DD
– 0.025
0.025
6
6
1.5
>500
10
10
V
V
Ω
Ω
A
mA
Switching Time
t
R
t
F
t
D1
t
D2
Rise Time
Fall Time
Delay Time
Delay Time
Figure 1, C
L
= 1000pF
Figure 1, C
L
= 1000pF
Figure 1, C
L
= 1000pF
Figure 1, C
L
= 1000pF
18
27
17
23
30
35
30
50
ns
ns
ns
ns
Power Supply
I
S
Power Supply Current
V
IN
= 3V (both inputs)
V
IN
= 0V (both inputs)
1.4
0.18
2.5
0.25
mA
mA
V S = 18V
+5V
INPUT
10%
90%
4.7µF
7
0.1µF
0.4V
18V
OUTPUT
T D1
TF
90%
T D2
TR
90%
10%
10%
0V
2
INPUT
1
8,1
OUTPUT
+5V
INVERTING DRIVER
90%
CL = 1000pF
4
2
6,5
INPUT
10%
0.4V
18V
OUTPUT
10%
T D1
TR
90%
T D2
90%
TF
3
10%
0V
NON-INVERTING DRIVER
Figure 1.
MIC4604/4605 Switching time test circuit.
6-12
MIC4604/4605
Micrel
Electrical Characteristics, continued
Specifications measured
over operating temperature range
with 4.5V
≤
V
DD
≤
18V, unless otherwise specified.
Symbol
Input
V
IH
V
IL
I
IN
Output
V
OH
V
OL
R
O
R
O
I
PK
I
R
Parameter
Test Conditions
Min
Typ
Max
Unit
Logic 1 High Input Voltage
Logic 0 Low Input Voltage
Input Current
0V < V
IN
< V
DD
2.4
V
DD
+ 0.3
0.8
V
V
µA
–10
10
High Output Voltage
Low Output Voltage
Output Resistance, Pull-Up
Output Resistance, Pull-Down
Peak Output Current
Latch-up Protection
I
OUT
= 10mA, V
DD
= 18V
I
OUT
= 10mA, V
DD
= 18V
Any Drain
Any Drain
Reverse Current
V
DD
– 0.025
0.025
8
9
1.5
>500
12
12
V
V
Ω
Ω
A
mA
Switching Time
t
R
t
F
t
D1
t
D2
Rise Time
Fall Time
Delay Time
Delay Time
Figure 1, C
L
= 1000pF
Figure 1, C
L
= 1000pF
Figure 1, C
L
= 1000pF
Figure 1, C
L
= 1000pF
20
30
20
30
40
40
40
60
ns
ns
ns
ns
6
Power Supply
I
S
Power Supply Current
V
IN
= 3V (both inputs)
V
IN
= 0V (both inputs)
1.5
0.2
3.5
0.3
mA
mA
6-13
